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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
The two electrons in each oxygen-hydrogen bond are not shared equally. They are more strongly attracted to the oxygen atom. The bond is polar, it has a 'negative end' (the oxygen atom) and a 'positive end' (the hydrogen atom). A hydrogen bond forms between a non-bonding pair of electrons on the oxygen atom of one water molecule and the hydrogen atom ('positive end') of another water molecule.